spring-boot-data-jpa、JPA实现负责查询、复杂搜索

JPA越来越丰富了，下面使用springboot3.x实现JPA分页

通过传入Example参数实现复杂字段查询

转自 https://lingkang.top/archives/jpa-shi-xian-fu-ze-cha-xun

依赖

        <dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-data-jpa</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-security</artifactId></dependency><dependency><groupId>org.springframework.boot</groupId><artifactId>spring-boot-starter-web</artifactId></dependency><dependency><groupId>com.mysql</groupId><artifactId>mysql-connector-j</artifactId><scope>runtime</scope></dependency> 

数据库配置

spring.jpa.show-sql=true
spring.jpa.open-in-view=false
spring.jpa.hibernate.ddl-auto=update
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver
spring.datasource.url=jdbc:mysql://localhost:3306/test?useUnicode=true&nullCatalogMeansCurrent=true&characterEncoding=utf-8&useSSL=false&serverTimezone=Asia/Shanghai
spring.datasource.username=root
spring.datasource.password=123456
spring.datasource.hikari.maximum-pool-size=10
spring.datasource.hikari.poolName=db1

启动类

@SpringBootApplication
@EnableJpaRepositories("top.lingkang.lingdongmall.repository")
@EntityScan("top.lingkang.lingdongmall.entity")
public class LingdongMallApplication {public static void main(String[] args) {SpringApplication.run(LingdongMallApplication.class, args);}}

接口

/*** @author lingkang* created by 2023/12/12*/
public interface ClassifyRepository extends JpaRepository<ClassifyEntity, String> {
}

调用

    public ResponseResultPage list(String level, String search, Integer page, Integer size) {// 分页，注意，page分页是从0开始计算的，0=第一页PageRequest pageRequest = PageRequest.of(page, size);ClassifyEntity classifyEntity = new ClassifyEntity();ExampleMatcher matcher = ExampleMatcher.matching();// 不为空时启用模糊搜索if (StrUtil.isNotBlank(search)) {// 要搜索的字段classifyEntity.setName(search);// 前、后匹配即 %search%，name对应的是实体name，配合上面的 classifyEntity.setName(search);matcher.withMatcher("name", match -> match.endsWith()).withMatcher("name", match -> match.startsWith());}Example<ClassifyEntity> example = Example.of(classifyEntity, matcher);Page<ClassifyEntity> all = classifyRepository.findAll(example, pageRequest);return new ResponseResultPage().setPage(page).setSize(size).setTotal(all.getTotalElements()) // 分页总数.setData(all.getContent()); // 查询内容}